JULIA GETS OWN POTTY AT PREMIERE

At the splashy premiere bash for “America’s Sweethearts,” mega-diva Julia Roberts had a message for co-stars Catherine Zeta-Jones, John Cusack and Billy Crystal: “It’s My Potty . . . You Can Cry If You Want To!” Julia’s cast mates had to use the theater toilets for nature’s calls, but she strong-armed the studio into providing a full-size trailer parked outside for her EXCLUSIVE use — surrounded by security heavies — so she could “freshen up” in private like a superstar!